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GeForce 825M vs Radeon HD 4790

Intro

The GeForce 825M uses a 28 nm design. nVidia has clocked the core frequency at 850 MHz. The DDR3 RAM works at a speed of 900 MHz on this specific card. It features 384 SPUs along with 16 TAUs and 8 Rasterization Operator Units.

Compare those specifications to the Radeon HD 4790, which uses a 55 nm design. AMD has clocked the core speed at 600 MHz. The GDDR5 RAM runs at a frequency of 800 MHz on this card. It features 640(128x5) SPUs along with 32 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4790 should perform a lot faster than the GeForce 825M overall. (explain)

Radeon HD 4790 102400 MB/sec
GeForce 825M 14400 MB/sec
Difference: 88000 (611%)

Texel Rate

The Radeon HD 4790 will be much (approximately 41%) better at texture filtering than the GeForce 825M. (explain)

Radeon HD 4790 19200 Mtexels/sec
GeForce 825M 13600 Mtexels/sec
Difference: 5600 (41%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4790 is a better choice, by far. (explain)

Radeon HD 4790 9600 Mpixels/sec
GeForce 825M 6800 Mpixels/sec
Difference: 2800 (41%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

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GeForce 825M

Amazon.com

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Radeon HD 4790

Amazon.com

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce 825M Radeon HD 4790
Manufacturer nVidia AMD
Year January 27 2014 2009
Code Name GK208 RV790
Memory 2048 MB 512 MB
Core Speed 850 MHz 600 MHz
Memory Speed 1800 MHz 3200 MHz
Power (Max TDP) 33 watts (Unknown) watts
Bandwidth 14400 MB/sec 102400 MB/sec
Texel Rate 13600 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 6800 Mpixels/sec 9600 Mpixels/sec
Unified Shaders 384 640(128x5)
Texture Mapping Units 16 32
Render Output Units 8 16
Bus Type DDR3 GDDR5
Bus Width 64-bit 256-bit
Fab Process 28 nm 55 nm
Transistors (Unknown) million 959 million
Bus PCIe 3.0 x8 PCIe 2.0 x16
DirectX Version DirectX 12 DirectX 10.1
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of data (counted in megabytes per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce 825M

Amazon.com

Check prices at:

Radeon HD 4790

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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